{"id":30461,"date":"2004-02-06T00:00:00","date_gmt":"2004-02-06T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/relaciones-entre-la-produccion-de-nitrogeno-organico-y-la-organizacion-trofica-del-ecosistema-pelagico-en-el-oceano\/"},"modified":"2004-02-06T00:00:00","modified_gmt":"2004-02-06T00:00:00","slug":"relaciones-entre-la-produccion-de-nitrogeno-organico-y-la-organizacion-trofica-del-ecosistema-pelagico-en-el-oceano","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/a-coruna\/relaciones-entre-la-produccion-de-nitrogeno-organico-y-la-organizacion-trofica-del-ecosistema-pelagico-en-el-oceano\/","title":{"rendered":"Relaciones entre la produccion de nitrogeno organico y la organizacion trofica del ecosistema pelagico en el oceano"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Marta Varela Rozados <\/strong><\/h2>\n<p>La liberaci\u00f3n de nitr\u00f3geno org\u00e1nico disuelto (nod) por las poblaciones microbianas tiene importantes consecuencias para los ecosistemas planct\u00f3nicos, debido a su relevante papel en los ciclos de la materia en general, y del n en particular. El tama\u00f1o del fitoplancton es el principal factor biol\u00f3gico que controla la organizaci\u00f3n tr\u00f3fica de las comunidades planct\u00f3nicas y, consecuentemente los flujos de materia org\u00e1nica en los ecosistemas pel\u00e1gicos. en este contexto, desentra\u00f1ar la relaci\u00f3n entre la estructura de la comunidad planct\u00f3nica y el flujo de n a trav\u00e9s del ecosistema pel\u00e1gico, constituye en la actualidad uno de los principales retos para la oceanograf\u00eda biol\u00f3gica.  en el presente trabajo de investigaci\u00f3n se estudi\u00f3 la relaci\u00f3n entre las tasas de liberaci\u00f3n de nod y la estructura de tama\u00f1os de fitoplancton en ambientes hidrogr\u00e1ficos muy contrastados en la capa superficial del oc\u00e9ano atl\u00e1ntico, cubriendo tanto regiones de afloramiento como regiones oligotr\u00f3ficas. adem\u00e1s, se determinaron las relaciones entre la liberaci\u00f3n de nod y la actividad del bacterioplancton. Para ello se llevaron a cabo medidas de la biomasa fitoplanct\u00f3nica (estimada a partir de la concentraci\u00f3n de clorofila a) fraccionada por clases de tama\u00f1o y biomasa y abundancia bacteriana; y se cuantificaron las tasas de absorci\u00f3n de n, liberaci\u00f3n de nod y producci\u00f3n bacteriana.  los resultados obtenidos y presentados en esta memoria mostraron que las tasas de liberaci\u00f3n de nod variaron entre 0,01 y 59,46 nmol n 1 elevado -1 h elevado -1, lo que representa entre un 4 y un 80 % de la incorporaci\u00f3n total de n. La estructura de tama\u00f1os de fitoplancton no present\u00f3 un patr\u00f3n de distribuci\u00f3n claramente definido con el porcentaje de liberaci\u00f3n extracelular de nod (ple), ya que \u00e9ste result\u00f3 ser una fracci\u00f3n muy variable de la absorci\u00f3n total de n. En promedio, los valores m\u00e1s elevados de ple se encontraron en los ambientes oce\u00e1nicos<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Relaciones entre la produccion de nitrogeno organico y la organizacion trofica del ecosistema pelagico en el oceano<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Relaciones entre la produccion de nitrogeno organico y la organizacion trofica del ecosistema pelagico en el oceano <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Marta Varela Rozados <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 A coru\u00f1a<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 02\/06\/2004<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Antonio Bode Riestra<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: manuel Varela rodriguez <\/li>\n<li>Emilio Mara\u00f1on sainz (vocal)<\/li>\n<li> Alvarez salgado xose Antonio (vocal)<\/li>\n<li>xos\u00e9 anxelu Guti\u00e9rrez mor\u00e1n (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marta Varela Rozados La liberaci\u00f3n de nitr\u00f3geno org\u00e1nico disuelto (nod) por las poblaciones microbianas tiene importantes consecuencias [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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